/* $Id: tif_aux.c,v 1.20.2.3 2010-06-09 21:15:27 bfriesen Exp $ */

/*
 * Copyright (c) 1991-1997 Sam Leffler
 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and 
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the names of
 * Sam Leffler and Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Sam Leffler and Silicon Graphics.
 * 
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
 * 
 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
 * OF THIS SOFTWARE.
 */

/*
 * TIFF Library.
 *
 * Auxiliary Support Routines.
 */
#include "tiffiop.h"
#include "tif_predict.h"
#include <math.h>

tdata_t
_TIFFCheckRealloc(TIFF* tif, tdata_t buffer,
          size_t nmemb, size_t elem_size, const char* what)
{
    tdata_t cp = NULL;
    tsize_t    bytes = nmemb * elem_size;

    /*
     * XXX: Check for integer overflow.
     */
    if (nmemb && elem_size && bytes / elem_size == nmemb)
        cp = _TIFFrealloc(buffer, bytes);

    if (cp == NULL)
        TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
                 "Failed to allocate memory for %s "
                 "(%ld elements of %ld bytes each)",
                 what,(long) nmemb, (long) elem_size);

    return cp;
}

tdata_t
_TIFFCheckMalloc(TIFF* tif, size_t nmemb, size_t elem_size, const char* what)
{
    return _TIFFCheckRealloc(tif, NULL, nmemb, elem_size, what);
}

static int
TIFFDefaultTransferFunction(TIFFDirectory* td)
{
    uint16 **tf = td->td_transferfunction;
    tsize_t i, n, nbytes;

    tf[0] = tf[1] = tf[2] = 0;
    if (td->td_bitspersample >= sizeof(tsize_t) * 8 - 2)
        return 0;

    n = 1<<td->td_bitspersample;
    nbytes = n * sizeof (uint16);
    if (!(tf[0] = (uint16 *)_TIFFmalloc(nbytes)))
        return 0;
    tf[0][0] = 0;
    for (i = 1; i < n; i++) {
        double t = (double)i/((double) n-1.);
        tf[0][i] = (uint16)floor(65535.*pow(t, 2.2) + .5);
    }

    if (td->td_samplesperpixel - td->td_extrasamples > 1) {
        if (!(tf[1] = (uint16 *)_TIFFmalloc(nbytes)))
            goto bad;
        _TIFFmemcpy(tf[1], tf[0], nbytes);
        if (!(tf[2] = (uint16 *)_TIFFmalloc(nbytes)))
            goto bad;
        _TIFFmemcpy(tf[2], tf[0], nbytes);
    }
    return 1;

bad:
    if (tf[0])
        _TIFFfree(tf[0]);
    if (tf[1])
        _TIFFfree(tf[1]);
    if (tf[2])
        _TIFFfree(tf[2]);
    tf[0] = tf[1] = tf[2] = 0;
    return 0;
}

static int
TIFFDefaultRefBlackWhite(TIFFDirectory* td)
{
    int i;

    if (!(td->td_refblackwhite = (float *)_TIFFmalloc(6*sizeof (float))))
        return 0;
        if (td->td_photometric == PHOTOMETRIC_YCBCR) {
        /*
         * YCbCr (Class Y) images must have the ReferenceBlackWhite
         * tag set. Fix the broken images, which lacks that tag.
         */
        td->td_refblackwhite[0] = 0.0F;
        td->td_refblackwhite[1] = td->td_refblackwhite[3] =
            td->td_refblackwhite[5] = 255.0F;
        td->td_refblackwhite[2] = td->td_refblackwhite[4] = 128.0F;
    } else {
        /*
         * Assume RGB (Class R)
         */
        for (i = 0; i < 3; i++) {
            td->td_refblackwhite[2*i+0] = 0;
            td->td_refblackwhite[2*i+1] =
                (float)((1L<<td->td_bitspersample)-1L);
        }
    }
    return 1;
}

/*
 * Like TIFFGetField, but return any default
 * value if the tag is not present in the directory.
 *
 * NB:    We use the value in the directory, rather than
 *    explcit values so that defaults exist only one
 *    place in the library -- in TIFFDefaultDirectory.
 */
int
TIFFVGetFieldDefaulted(TIFF* tif, ttag_t tag, va_list ap)
{
    TIFFDirectory *td = &tif->tif_dir;

    if (TIFFVGetField(tif, tag, ap))
        return (1);
    switch (tag) {
    case TIFFTAG_SUBFILETYPE:
        *va_arg(ap, uint32 *) = td->td_subfiletype;
        return (1);
    case TIFFTAG_BITSPERSAMPLE:
        *va_arg(ap, uint16 *) = td->td_bitspersample;
        return (1);
    case TIFFTAG_THRESHHOLDING:
        *va_arg(ap, uint16 *) = td->td_threshholding;
        return (1);
    case TIFFTAG_FILLORDER:
        *va_arg(ap, uint16 *) = td->td_fillorder;
        return (1);
    case TIFFTAG_ORIENTATION:
        *va_arg(ap, uint16 *) = td->td_orientation;
        return (1);
    case TIFFTAG_SAMPLESPERPIXEL:
        *va_arg(ap, uint16 *) = td->td_samplesperpixel;
        return (1);
    case TIFFTAG_ROWSPERSTRIP:
        *va_arg(ap, uint32 *) = td->td_rowsperstrip;
        return (1);
    case TIFFTAG_MINSAMPLEVALUE:
        *va_arg(ap, uint16 *) = td->td_minsamplevalue;
        return (1);
    case TIFFTAG_MAXSAMPLEVALUE:
        *va_arg(ap, uint16 *) = td->td_maxsamplevalue;
        return (1);
    case TIFFTAG_PLANARCONFIG:
        *va_arg(ap, uint16 *) = td->td_planarconfig;
        return (1);
    case TIFFTAG_RESOLUTIONUNIT:
        *va_arg(ap, uint16 *) = td->td_resolutionunit;
        return (1);
    case TIFFTAG_PREDICTOR:
                {
            TIFFPredictorState* sp = (TIFFPredictorState*) tif->tif_data;
            *va_arg(ap, uint16*) = (uint16) sp->predictor;
            return 1;
                }
    case TIFFTAG_DOTRANGE:
        *va_arg(ap, uint16 *) = 0;
        *va_arg(ap, uint16 *) = (1<<td->td_bitspersample)-1;
        return (1);
    case TIFFTAG_INKSET:
        *va_arg(ap, uint16 *) = INKSET_CMYK;
        return 1;
    case TIFFTAG_NUMBEROFINKS:
        *va_arg(ap, uint16 *) = 4;
        return (1);
    case TIFFTAG_EXTRASAMPLES:
        *va_arg(ap, uint16 *) = td->td_extrasamples;
        *va_arg(ap, uint16 **) = td->td_sampleinfo;
        return (1);
    case TIFFTAG_MATTEING:
        *va_arg(ap, uint16 *) =
            (td->td_extrasamples == 1 &&
             td->td_sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA);
        return (1);
    case TIFFTAG_TILEDEPTH:
        *va_arg(ap, uint32 *) = td->td_tiledepth;
        return (1);
    case TIFFTAG_DATATYPE:
        *va_arg(ap, uint16 *) = td->td_sampleformat-1;
        return (1);
    case TIFFTAG_SAMPLEFORMAT:
        *va_arg(ap, uint16 *) = td->td_sampleformat;
                return(1);
    case TIFFTAG_IMAGEDEPTH:
        *va_arg(ap, uint32 *) = td->td_imagedepth;
        return (1);
    case TIFFTAG_YCBCRCOEFFICIENTS:
        {
            /* defaults are from CCIR Recommendation 601-1 */
            static float ycbcrcoeffs[] = { 0.299f, 0.587f, 0.114f };
            *va_arg(ap, float **) = ycbcrcoeffs;
            return 1;
        }
    case TIFFTAG_YCBCRSUBSAMPLING:
        *va_arg(ap, uint16 *) = td->td_ycbcrsubsampling[0];
        *va_arg(ap, uint16 *) = td->td_ycbcrsubsampling[1];
        return (1);
    case TIFFTAG_YCBCRPOSITIONING:
        *va_arg(ap, uint16 *) = td->td_ycbcrpositioning;
        return (1);
    case TIFFTAG_WHITEPOINT:
        {
            static float whitepoint[2];

            /* TIFF 6.0 specification tells that it is no default
               value for the WhitePoint, but AdobePhotoshop TIFF
               Technical Note tells that it should be CIE D50. */
            whitepoint[0] =    D50_X0 / (D50_X0 + D50_Y0 + D50_Z0);
            whitepoint[1] =    D50_Y0 / (D50_X0 + D50_Y0 + D50_Z0);
            *va_arg(ap, float **) = whitepoint;
            return 1;
        }
    case TIFFTAG_TRANSFERFUNCTION:
        if (!td->td_transferfunction[0] &&
            !TIFFDefaultTransferFunction(td)) {
            TIFFErrorExt(tif->tif_clientdata, tif->tif_name, "No space for \"TransferFunction\" tag");
            return (0);
        }
        *va_arg(ap, uint16 **) = td->td_transferfunction[0];
        if (td->td_samplesperpixel - td->td_extrasamples > 1) {
            *va_arg(ap, uint16 **) = td->td_transferfunction[1];
            *va_arg(ap, uint16 **) = td->td_transferfunction[2];
        }
        return (1);
    case TIFFTAG_REFERENCEBLACKWHITE:
        if (!td->td_refblackwhite && !TIFFDefaultRefBlackWhite(td))
            return (0);
        *va_arg(ap, float **) = td->td_refblackwhite;
        return (1);
    }
    return 0;
}

/*
 * Like TIFFGetField, but return any default
 * value if the tag is not present in the directory.
 */
int
TIFFGetFieldDefaulted(TIFF* tif, ttag_t tag, ...)
{
    int ok;
    va_list ap;

    va_start(ap, tag);
    ok =  TIFFVGetFieldDefaulted(tif, tag, ap);
    va_end(ap);
    return (ok);
}

/* vim: set ts=8 sts=8 sw=8 noet: */
/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 8
 * fill-column: 78
 * End:
 */
